X g gonduitfor electric conductors



(No Mode l.)

- D. H. DORSETT.

. UONDUIT FOR ELECTRIC OONDUCTORS.

No. 340,433. x PatentedApr.20,1886.

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DANIEL H. censure, or (intense, iLLinors.

QONDUiT' FQR ELECTRiC CQNDUGTQRS.

SPLQZFICATION forming part 0534322815 Fatent 35D. f rfi finflalfiii .Ettiirii 20,1886. Application filed October 15, 18851 Serial No. 179.961 (No, model.) Patented in England October 30,1885, No. 13,109.

To all whom it Hwy concern/.-

Be it known that I, DAn nL H. Donsn'r'r, a citizen of the United States, residingat Chieego, in the county of Cook and State of Illinoisfliaveinvcnted certain new and useful Iinpr'ovementsin Conduits for Electric Conductors, of which the following isa specification, reference being bed to the drawings ac companying and forming apart of the some. inalfapplication' i'or'patent of even date herewith, Serial No. 179,961,.1 have shown and described a system of underground conductors in which circuits of several kinds or clesses are closely associated in amanner that secures economy in laying, a very effective protection and insulation, and an easy means of access to and control ofthe whole system. This system comprises three lines of pi pc or conduit, and distributing-branches as manyin number as the case may require. Of these pipes one contains the trunk wires or lines of electric-telegraph circuits used for communicating with distnnt'poi-nts, another circuit for.

local intercomnninication, and the third electric-light circuits or the-like. These three lines of pipe (ouch line may comprise two or more pipes when the number-oi circuits is great) areflaid in close proxin-iity under-"the streets of a. city or town, and at the intersection of the streets are led into what 1 term man-holes, in which access may be had .to any of the circuits. There are also provided junction-boxes or hand-holes for running branches off from the local'or electriciight.

lines to the houses and. b

u l'dmgs along the way.

My present invention,howevcr, is confined to the mun-holes; and it'consi'sts in a new and useful construction ot'thesame. These mnn-hoics are subtcrrnuczui boxes or chambers which the pipc-lines'entcr, and in which the wires are carried from one pipe or scciion ofpipe Eo snother, as may be necessary; -'.l.hey are huge enough to permit a man to enter (or drawing out orjnscrting wires or making connections or repairs. They are water-tight, and ere made in the general manner described in a former patent to me, No. 322,520.

My improvements are designed to adapt those man-hol'cs to'the system which I have briefly describedoboveh 130 this end I make them oval or oblong in cross-section, placing .soction oval or oblong.

The ninin liue conduits enter the broader sides which the couduilsenicr the sides.

them with their major axis nt right angles to the direction of the three pipelines, whereby the'pipes are brought into thechamber in more accessible and convenient points .and a saving of material eifected. 'In molding the chamber also from the plastic insulating com pound which I use, I form one or more partitions within it, using the'sa'mc material for .1

holes are used. Fig. 2 is a vertical central I section of one 0!. the man-holes. Fig. 3 is 'a. plan view of the some.

The purpose for which the used is shown in Fig. 1.

.lnsaid figure, A .13 designate two streets of a city or town. Along the streets are run the uudcrgro nul conduits. number. That designated by Q is designed to contain eleciric-light and power circuits, that man-holes are by D the-circuits (or local inlei-commnnicatiou' and the like, and that by E, \YlllOll'lS prcferably in the center, the trunk lines or circuits to. distant points and other towns. At the intorsection of the streets these conduits all enter a. man-hole, F, and, whennecessary, branch; 3

of any of the circuits, as KL, are'run off from the manhole along the side streets.

The manhole consists of a deep box orchninher, (i, with n contracted opening, and in crossas shown in Fig. 3.

of this chamber, as shown in Fig. 1. v The interior of the man-hole is divided into compartments by moons of one or more-pertitious, ll, which extend up above the level at The-purpose of the partition or partitions is to isolate the elcctriclight wires from all the others.

They are three in- [he man-hole is madr t a plastic insulating compound discovered byme, and which is composed of the material named in about the following proportions: Fii'tygnllons oi pnrtiallydistilled coal-tar, two gallons of paraf- 'fine, one hundred and fifty pounds of silicious sand, fifty pounds of pulverized ashes and cinders, two pounds of oxide of manganese, and one of ammonium chloride. These'materials are thoroughly mixed and heated. While the mixture is hot and soft it is packed in a seetional mold of any proper kind and the minhole formed in one piece in this manner, This planmay be departed from, however, as the various parts of the man-hole may be molded independently, and-then united together by heating the edges of the diflerent parts or forming the points by additional muter'ial'in a soft condition.

Various means maybe adopted for closing themun-holes In the present case an iron rim or flange, N,;is joined to the insulating material, and an iron plate or cover is secured to-this bya bolt, M,,tl1at passes through a cross-bar, P, secured to the rim. The cover, however, forms no part of my present invention.

\VhotI claim isl I A manhole or subterranean chamber for systems of underground electric conductors, having one or more insulating interior parti tions, the whole being formed or molded in one piece of a plastic insulating mnterial'and oblong or oval. in shape, in combination with two or more lines of pipes or conduits entering the compartment-sthrough the broader sides of thechmnbcr, as herein set forth.

I DANIEL H. DORSETP.

\Vitnesses: I I

.TAs. DANlEL COMPTON, PARKER W. Pics. 

